A practical limitation on transport by ripple‐trapped ions
| Autor: | R. D. Hazeltine, K. W. Gentle |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Tokamak Field line Ripple Computational Mechanics General Physics and Astronomy Collisionality Condensed Matter Physics Ion law.invention Magnetic field Computational physics Physics::Plasma Physics Mechanics of Materials law Electric field Diffusion (business) Atomic physics |
| Zdroj: | Physics of Fluids B: Plasma Physics. 3:3198-3200 |
| ISSN: | 0899-8221 |
| DOI: | 10.1063/1.859801 |
| Popis: | Ripple in the toroidal field of tokamaks is predicted to enhance ion transport at low collisionality because ions trapped in the magnetic wells are prevented from moving poloidally along field lines; their grad‐B drift then can generate a large radial step for diffusion. However, tokamaks generally have radial electric fields that will drive poloidal motion even for ripple‐trapped ions, thereby moderating the transport. For typical parameters, electric field effects enter for collisionalities only somewhat smaller than ripple effects themselves. This suggests that ripple effects will not seriously degrade thermal ion transport. High‐energy populations remain subject to strong effects of ripple. |
| Databáze: | OpenAIRE |
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